22/08/2025
It might seem like a superficial detail: the quality of a dog’s coat, patches of hair loss, or changes in regrowth after clipping. The skin is the largest organ of the body and is tightly linked to the nervous and endocrine systems. When a dog is in chronic pain or under prolonged stress, there are measurable changes in hormone levels especially cortisol, the body’s main stress hormone.
Elevated or dysregulated cortisol can interfere with:
Skin barrier function
Follicle health
Hair growth cycles
In simple terms, a stressed or painful body may divert resources away from hair growth, either slowing it, changing its quality, or halting it altogether.
Some dogs with chronic pain (especially orthopaedic or spinal issues) will show:
Patches where hair doesn’t grow back normally after clipping or surgery
Thinner, duller, or dry coat texture.
Asymmetrical coat quality, especially over painful joints or areas of tension
Excess licking or chewing, often mistaken as purely behavioural, that causes localised hair loss
This isn’t just anecdotal. These signs may be subtle, but they can be a critical part of the diagnostic picture when we suspect low-grade or hidden pain particularly in stoic dogs who may not show obvious lameness or distress.
In people, chronic pain conditions like fibromyalgia, neuropathic pain, or rheumatoid arthritis are often linked with changes in skin integrity and hair follicle function.
A study by Wanner et al. (2003) demonstrated that neurogenic inflammation in chronic pain patients altered hair cycling and skin healing. Similarly, studies in chronic stress and PTSD patients show dysregulated hair growth due to cortisol imbalance and nervous system overactivation.
Palestrini et al. (2010) noted that dogs with compulsive behaviours and chronic stress had distinct differences in coat condition compared to behaviourally stable control dogs.
If a dog’s coat isn’t growing back as expected or if you notice unusual changes in skin or hair texture it may be time to consider what else might be going on. Pain, chronic discomfort, or emotional stress should always be on the list of differentials.
Post inspired by the awesome .adoodledoo